I believe that I remember reading somewhere in Axiom's literature that the amps are designed that way - they go into sleep mode in absence of a signal then wake up when a signal is received.

They go into sleep/standby mode, yes, but they still drain power.

I've never read anything stating that there are detrimental effects to turning the sub on and off when needed. My sub goes for long lengths of time without being used, so I'm going to pick up a remote on/off switch for it, rather than wasting power.

It's funny, people see my compact florescent lights, turning off my subs, and even my computer these days. They think I'm environmentally conscientious. Not really, I just don't like large electric bill.

Well I just got off the phone and exchanged emails with JC. Very nice to deal with. New amp is on the way with one caveat. Apparently when I bought my EP600 it only had a 3 year warranty not 5 as now. However they are exchanging the amp with the newest version for $175 plus $30 shipping. Which I think is fair. So for $205 I have a new amp on the way.

I sure hope it fixes things cause I just plugged the thing back in and it's rumbling and crackling like crazy! I'm always second guessing things like maybe it could be the voice coil on the speaker too but it's doing the same thing that it did last time and the last revision and new amp had it working fine for the last 2 years or so. Lets hope i get more than 2 more years out of this next amp.

Anyway, kudos again to their customer service. They seem to be willing to do what ever it takes to make it right.

Having listened to the newer upgraded version of my EP500 replacement amp for a few days now, I'm very pleased.

Could be placebo effect, but the replacement amp definitely seems to be controlling the woofer better. Low end seems tighter, smoother and more solid. I kept thinking it sounded different when listening to music, so I ran MultiXT32 again. Excellent so far...

I also notice that the green light stays on all the time, how do I know if, when it goes into standby mode? I thought the light changes when in standby mode?